Abstract
Simultaneous protection of sensitive renewable power generators and sensitive loads under transient voltage disturbances is an urgent issue in current power systems. Most existing solutions are based on separate custom power devices and energy storage systems. To efficiently utilize renewable energy under voltage sags and reduce energy storage capacity, a current-source-inverter interline dynamic voltage restorer (CSI-IDVR) based on superconducting magnetic energy storage (SMES) is proposed. The current source topology is designed for the IDVR to obtain a more appropriate current rise limitation and fewer switches. The CSI-based voltage dual control is designed and implemented to suppress the voltage oscillations, ensuring the transient stability of the sensitive renewable power generator and sensitive loads during asymmetric grid faults. An internet data center (IDC) combined with a typical renewable energy generator, i.e., doubly-fed induction generator (DFIG), is analyzed. Under transient voltage disturbances, the proposed CSI-IDVR can maintain the appropriate voltage profiles of the DFIG and IDC. Compared to the separate DVRs, the required SMES capacity in the CSI-IDVR can be substantially reduced. The feasibility and performance of the proposed CSI-IDVR are verified by numerical simulation.
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